A drive mechanism for a drug delivery device having a rotationally fixed plunger rod driven by a lead screw. The lead screw engages a free lock which is coupled to a release knob. A dose setting dial cooperates with an inner cylinder using a clutch to establish the axial movement of the plunger rod during dose setting and dispensing.

A drive mechanism for a drug delivery device having a rotationally fixed plunger rod driven by a lead screw. The lead screw engages a free lock which is coupled to a release knob. A dose setting dial cooperates with an inner cylinder using a clutch to establish the axial movement of the plunger rod during dose setting and dispensing.

A non-slip dose delivery mechanism includes a housing, a non-rotating piston rod, a nut, a piston rod guide, a driver, a ratchet and a brake. The non-rotating piston rod has a threaded outer surface. The nut includes an inner surface in threaded engagement with the threaded outer surface of the non-rotating piston rod. The nut is configured to rotate and translate axially in a proximal direction relative to the non-rotating piston rod during dose setting. The piston rod guide is rotationally fixed relative to the housing and is configured to prevent rotation of the piston rod. The driver includes an inner surface and an outer surface, the inner surface being in a rotationally fixed engagement with the nut. The ratchet is rotationally fixed to relative to the housing. The brake is positioned between the nut and the ratchet.

A data collection device comprises: a first portion having one or more features configured for attaching of the first portion to a dosage knob of an injection device; a second portion rotatably coupled with the first portion, wherein at least part of the second portion is movable axially relative to the first portion; a sensor arrangement configured to detect rotation of the first portion relative to the second portion; and a processor arrangement configured to, based on said detected movement, determine a medicament amount expelled by the injection device, wherein the coupling arrangement is configured to provide a non-permanent coupling between the first portion and the dosage knob of the injection device.

An injection device comprises a dose selector, rotatable by a user to set a dose to be ejected from the injection device and a drive assembly including a drive shaft (140) and a plunger element (145), the drive assembly being capable of providing an axial force for ejecting a dose of medicament from a medicament container. A dose limit nut (141) is provided which is rotationally coupled to but not axially coupled to said drive shaft. The plunger element is threaded so that the dose limit nut is engaged with said plunger element via said thread, in order to guide relative axial movement between the dose limit nut and the plunger element. The dose limit nut is provided with dose limiting endstops which are capable of limiting axial travel of said dose limit nut with respect to said plunger element, so as to limit maximum and minimum doses of medicament which can be set by the user. In addition, the dose limit nut comprises a last dose rotary endstop feature which prevents further rotation of said dose limit nut with respect to said drive shaft so as to prevent the user setting a dose that is greater than an injectable volume of medicament remaining in said medicament container.

Medication delivery devices are provided having a sensor in the form of a switch having a conductive pad and a cantilevered arm that is moveable toward and away from the conductive pad. Contact between the cantilevered arm and the conductive pad changes the state of the switch, while lack of contact between the cantilevered arm and the conductive pad changes the state of the switch. The switch may be used to sense dosage of medication delivered during dose delivery. The switch may interact with a rotating component having a plurality of teeth that slide against the cantilevered arm during dose delivery.

A drive mechanism for a medicament delivery device is presented having an activation rod provided with external activation rod threads having a first thread helix angle, an activation knob rotationally locked with the activation rod, wherein the activation knob is configured to be moved between a first axial position relative to the activation rod in which the activation knob is prevented from rotation and a second axial position in which the activation knob is allowed to rotate in a first direction, an axially slidable drum which is rotationally locked, a dose drum rotationally locked relative to the activation rod, wherein the dose drum is configured to rotate relative to the slidable drum, an indicator drum provided with external indicator drum threads having a second thread helix angle, wherein rotation of the activation knob in the first direction causes concurrent first rotation of the activation rod and the dose drum in accordance with the first thread helix angle.

An injection device comprises a housing with a receptacle for a product, a dosing mechanism for setting a product dosage to be administered and for displaying the product dosage that has been set, and a dispensing mechanism for dispensing the product. The dosing mechanism comprises a dosing sleeve which is rotatable relative to the housing in a first direction for setting a product dosage and which is rotatable relative to the housing in a second, opposite direction for correcting or dispensing a product dosage. The dispensing mechanism comprises a piston rod, at least one sleeve, and a clutch. The device further comprises a first detector for detecting movement of the clutch relative to the dosing sleeve and/or the housing and/or the at least one sleeve and a data processing unit connected to the first detector for reading, storing, processing, transmitting, and/or displaying signals received from the first detector.

An electronic system for a drug delivery device comprising a dose setting and drive mechanism with a first member, wherein the first member performs a specific movement relative to a second member during a dose delivery operation. The electronic system comprises a first switch configured to be activated by a pre-defined user operation, wherein the pre-defined user operation includes a user operation that is expected in conjunction with dose delivery operation, a second switch for indicating the specific movement, and a sensor arrangement for a motion sensor system for providing position data that allows to distinguish between different positions of the first member relative to the second member.

A drug delivery device comprising or adapted to receive a drug-filled cartridge, comprising a piston rod adapted to be rotated by a drive member to thereby move the piston rod distally during expelling, dose setting means allowing a user to simultaneously set a dose amount to be expelled, and a releasable locking mechanism adapted to rotationally lock the drive member relative to the housing during dose setting. The device further comprises release means actuatable between a dose setting mode and an expelling mode, wherein the locking mechanism is released when the release means is actuated from a dose setting mode to an expelling mode.